Valve mechanism.



H. T. HOLBROOK'J" VALVE MECHANISM.

APPLICATION FILED 061121 1916.

1 igfiggfima Patented Aug. 28, 1917.

INVENTOR ATTORNEY TATE PATENT @FFIQE.

HAROLD T. I-IOLBROOK, OF HARTFORD, KENTUCKY.

VALVE MECHANISM.

To all whom itmey concern:

Be it known that I, HAROLD T. I-IoLBRooK,

a citizen of the United States, residing at Hartford, in the county ofOhio and State of Kentucky, have invented new and useful Improvements inValve Mechanism, of which the following is a specification.

This invention relates to improvements in valve mechanism and hasparticular application to mechanically operated valve mechanism for usein connection with ammonia pumps.

Ammonia pumps, as a rule, are equipped with pressure controlled inletand exhaust valves which operate after the fashion of check valves sothat when the piston moves downwardly to draw in the charge of gas, theinlet valve will open and the exhaust valve close, while in the reversemovement of the piston to deliver the charge, the inlet valve will closeand the exhaust valve open. These pressure controlled valves oftenbecome gas bound, thereby rendering the pump inefficient and defectivein operation, and necessitating the shutting down of the pump to remedythe defects in the valve. In carrying out the present invention, it ismy purpose to provide a mechanically operated valve mechanism forammonia pumps wherein the inlet and exhaust valves will be positivelyoperated, thereby eliminating the possibility of the valves becoming gasbound, and wherein the valve chambers will be so constructed as to becapable of ready attachment to and removal from the pump cylinder.

It is also my purpose to provide valve mechanism of the class describedwherein the ends of the valve chambers will be closed 40 by removableplates so that access may be had to such chambers to facilitate theassembling and dismantling of the valve mechanism.

With the above and other objects in view, 45 the invention consists in'the construction, combination, and arrangement of parts hereinafter setforth and falling within the scope of the claim.

In the accompanying drawing Figure 1 is a vertical sectional viewthrough an ammonia pump equipped with valve mechanism constructed inaccordance with the present invention, the driving engine of the pumpbeing shown in end eleva- 55 tion.

Specification of Letters Patent.

Patented Aug. 28, 191 *3.

Application filed October 21, 1916. Serial No. 126,990.

Fig. 2 is a top plan view of the pump.

Fig. 3 is a horizontal sectional view on the line 33 of Fig. 1.

Figs. 4 and 5 are detail views of the valve operating cams for the inletand exhaust valves, respectively.

Referring now to the drawing in detail, 1 designates a horizontal mainshaft journaled in suitable bearings 2 and having one end equipped witha fly wheel 3. This shaft 1 is provided with cranks 4: and 5, suit-ablyspaced apart. 6 designates a steam engine, which in the present instanceis of the horizontal type, and the outer end of the connecting rod ofthe engineG is connected with the crank 1 so that in the operation ofthe steam engine the crank shaft will be revolved. Arranged adjacent tothe crank 5 and spaced apart longitudinally of the shaft 1 are uprights7 disposed at opposite sides of the crank 5, and secured to the upperends of the uprights 7 is a vertical pump cylinder 8, in which ismounted for rectilinear movement a piston 9 connected to the upper endof a vertical piston rod 10 that projects through the lower end of thecylinder 8 and has the lower end connected to the crank 5, so that inthe rotation of the shaft 1 under the action of the steam engine (3motion will be imparted to the piston 9 to reciprocate the latter withinthe cylinder 8. Formed in the cylinder 8 adjacent to the upper endthereof are diametrically opposed inlet and exhaust openings 11 and 12,respectively. Arranged at opposite sides of the cylinder 8 and incommunication with the inlet and exhaust ports 11 and 12, are valvechambers each embodying a casting 13 partially circular in horizontalsection and having the ver tical edges thereof formed with outwardlyextending flanges 14: that abut the outer wall of the cylinder 8. Theseflanges are formed with bolt holes that aline with similar holes in thecylinder, and passed through these alining holes are stud bolts 15whereby the castings 13 may be securely fastened to the cylinder. Eachcasting 13 is provided with a transverse partition 16 formed with avalve seat 17, and cooperating with the valve seat 17 is a valve disk 18equipped with a depending stem 19 having the lower end formed with afoot 20. Surrounding the stem 19 between the partition and the foot 20is an expansion spring 21 that acts to hold the valve disk 18 normallyin engagement with the seat 17. Closing the upper and lower ends of thevalve chambers are removable plates 22 that are formed with bolt holesalining with similar holes in the respective end edges of the casting-25 are yokes 27 in which are rotatably mounted rollers 28 that ride uponcams 29 and 30, respectively, fastened to the shaft 1 at opposite sidesof the crank 5.

Leading into the casting, communicating with the inlet port 11, belowthe valve in such casting, is a supply pipe 31, while leading from theremaining casting below the valve therein is a delivery pipe 32.

In practice, the piston 9 is reciprocated within the cylinder 8 undertheaction of the main shaft 1, and the steam engine 6, and in the downwardmovement of the, piston 9 the cam 29 operates the valve in the inletvalve chamber to open position so that a charge of gas may be drawn pastsuch valve into the cylinder 8, while the cam 30 releases the exhaustvalve so that the spring 21 of such valve may close the latter and holdthe same closed. On the other hand, when the piston 9 moves upwardlywithin the cylinder 8, the inlet valve is closed and the exhaust valveopen so that the charge may be delivered to the pipe 82.

It will be seen that I have provided a valve machanism which will befound especially useful in connection with ammonia pumps and wherebythepossibility of the valves becoming gas bound is obviated,thus enablingthe pump to operate at all times and the plant to deliver its full quotaof work. Furthermore, it will be seen that I have provided valvemechanism wherein the valve chambers may be quickly and convenientlyattached to the pump cylinder and removed therefrom, and wherein accessmay be readily had to the valve disks and seats.

lVhile I have herein shown and described the preferred form of myinvention by way of illustration, I wish it to be understood that I donot limitor confine myself to the precise details of construction hereinde scribed and delineated, as modification and variation may be madewithin the scope of the claim and without departing' -from the spirit ofthe invention.

I claim In valve mechanism of the class described, the combination witha pump cylinder having inlet and; exhaust ports therein diametricallyopposite each other, of valve chambers arranged at opposite sides ofsaid cylinder at the respective ports therein, each chamber embodying-acasting partially circular in cross section and having the verticaledges thereof formed with attaching Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I I I

